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A comment on Ask HN: Who's still keeping a DOS machine up because the business depends on it?. Parent comment

Re:Ask HN: Who's still keeping a DOS machine up because the ... by JdeBP on Saturday September 26, 2026 @02:21AM (#49853763)
Not wholly apocryphal. The U.K.'s air traffic control ran, and possibly still is running, on an IBM 4381 substituting for an IBM 9020.

* https://news.ycombinator.com/item?id=49763972

They've reportedly already tried, and failed, to replace it with a more modern system.

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